\begin{tabular}{l*{9}{c}}
\hline\hline
            &           a&            &            &            &            &            &            &            &            \\
            &          c1&          c1&          c1&          c1&          c1&          c1&          c1&          c1&          c1\\
\hline
r1          &       -0.80&       -0.60&       -0.40&       -0.20&       -0.00&        0.20&        0.39&        0.59&        0.80\\
r2          &       -0.20&       -0.15&       -0.10&       -0.05&       -0.00&        0.05&        0.10&        0.15&        0.19\\
\hline\hline
\end{tabular}
